Treating filamlnts for incandescent electric lamps



(No Model.)

J. BRADLEY. TREATING FILAMENTS FOR INGANDESCENT ELECTRIC LAMPS.

No. 464,005. Patented Dec. 1, 1891.

in: NDRRI! PETERS 00., monrumm, WAsNmoYoN, o. c.

NITZED STATES FFICE.

PATENT TREATING FILAMENTS FOR INCANDESCENT ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 464,005, dated December1, 1891.

' Application filed J'unefi, 1891. $erialNo.395,89Z. (N0 model.)

To allwhom it may concern.-

Be it known that 1, JAMES BRADLEY, a subject of Great Britain,.residingat Massillon, county of Stark, State of Ohio, have invented a new anduseful Improvement in Apparatus for Treating Filaments for IncandescentElectric Lamps, of which the following is a full,

clear, and exact description, reference being had to the accompanyingdrawings, making part of this specification.

My invention relates to an improved apparatus for treating filaments forincandescent electric lamps, the object of which is to provide means bywhich a carbonized filament may be freed from loose or partly-detachedparticles of carbon and to treat the filament with hydrocarbon, fromwhich a deposit is made thereon by an electric current.

WVith these ends in view my invention consists of certain features ofconstruction and combination of parts, as will be hereinafter described,and pointed out in the claim.

Referring to the accompanying drawings, Figure 1 is a vertical sectionalview illustrating my invention, whichv consists of a U- shaped tube orinverted siphon A, having at the upper end portion of one limb B anenlarged cylinder-chamber portion 0, surrounded at its upper end with anoutside overflow cup or receptacle D and at its other end portion orlimb E an enlarged chamber portion F, which may be spherical, as shown;or, if preferred, other forms may be substituted.

. To the upper end of the limb E is secured a pipe G, leading to an aircompressor or chamber containing compressed air. In said pipe isprovided a three-way cook a, by which communication may be opened atwill between the bulb or chamberF and the source of supply of compressedair or with the chamber F and out into open-space. To the upper end ofthe cylinder 0 is fitted and ground to an air-tight joint a disk or capI), having tubular projections c, in which the wires 01 and the two endsof the filament e are secured in contact.

To prepare the apparatus foroperation, the cap I) is removed and aquantity of mercury f poured therein, which will rise in the bulb orchamber F, as shown, to a level of that shown in the cylinder 0. Aquantity of hydrocarbon is placed in the cylinder O, filling it to apoint near the lower end portion of the filament 6. One of the wires dis connected with a suitable generator or other device adapted to chargethe filament, the other with the earth or other suitable conductor, themercury to form a fluid piston between the compressed air and thehydrocarbon in the cylinder 0.

The operation is as follows: The cook a is turned to open communicationwithv the compressed-air chamber, the pressure of which on the mercuryin the chamber F will cause the mercury to flow down the tube E and upthe tube B into the cylinder 0, raising the hydrocarbon fluid up,immersing the filament e, and filling the cup D to point above the cupI), at which instant the cook a is turned to open communication from thechamber F with open space. Removing the air-pressure from the mercury,it will flow back to normal position, allowing the fluid hydrocarbon todrop to a point below the filament e, leaving the upper end portionfilled with hydrocarbon gas, and the upper end of the cylinder sealed bythe cap and liquid in the cup D. The electric current is nowturned onand conducted by the wire at to and from the filament, by which filamentis heated to incandescence. As a result the filament will receive adeposit of carbon from the hydrocarbon bath and the inert hydrocarbongas by which it is surrounded. To facilitate the operation I havesecured a second pipe H to the upper portion of the limb or tube E,connecting said part with an exhaust-chamber, in which pipe is placed acock h, by which communication may be opened or closed between theexhaust chamber and the mercury chamber. By the use of this arrangementthe mercury may be moved more quickly to draw the hydrocarbon down fromfilament. A small spigot 76 is provided ator near the lower end of thecylinder 0, by which the hydrocarbon may be drawn out.

Having thus fully explained the nature and object of my invention, whatI claim'as new, and desire to secure by Letters Patent, is-

The combination, in an apparatus fortreating carbonized filament, oftube A, having vertical portions E and B, the latter provided with ahydrocarbon-chamber O and an overof the conductors cl and filament e andto seal the upper end of the chamber, the portiontherefrom,substantiallyas described, and for E, having an enlargedportion F, adapted to the purpose set forth. IO hold a quantity of fluidmercury, a pipe G to In testimony whereof I have hereunto set connectsaid portion with a blower or colnmy hand this 25th day of May, A. D.1891.

pressed-air chamber, and a fluid-mercury pis- JAMES BRADLEY. ton interjacent the hydrocarbon and the com- Witnesses:

pressed air, whereby the hydrocarbon may be XV. K. MILLER,

raised to cover the filament and be drawn CHAS. R. MILLER.

